Revolving puddling-furnace



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S. T. WELLMAN & G. W. GOETZ.

. REVOLVING PUDDLING FURNACE.

No. 358.763. Patented Mar. 1,1887.

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SAMUEL T. \VELLMAN AND GEORGE \V. GOETZ, OF CLEVELAND, OHIO.

REVOLVING PUDDLlNG-FURNACE.

SPECIFICATION forming part of Letters Patent No. 358,763, dated March 1, 1887..

Application filed January 16, 1886. Serial No. IS JIR. (No model.)

revolving paddling-furnaces in which the shell or casing of the furnace ismade to correspond with the desired internal configuration of the lining, preferably polygonal -Jor instance, a pentagon-to the end that, with the lining of such internal form in cross-section as may be considered best adapted to revolve and properly work and shape the mass being treated in the furnace, the said lining may be made ofuniform thickuess,and thereby rendered more durable than linings of unequal thickness, as heretofore used in this class of furnaces.

Herctofore the shells of revolving paddling furnaces have been round in cross-section and provided with a lining, usually of iron ore. It is not practicable to have the inner face of the lining approximate a round smooth surface,for the reason that some projections, depressions, or angularities of form are necessary to rotate the mass being treated by carrying the mass up along the ascending side of the furnace, so that the same may roll and tumble back by gravity, such rolling and tumbling being essential to properly work and shape the mass. \Vhen the lining is approximately round and smooth on its inner face,the semi-molten mass slides on the lining and is not elevated enough to be rotated, and, instead of being properly worked and shaped into a ball or suitable round form in cross-section, themassisspread outin broad unwieldly proportions, so that it cannot be properly handled in working or removed from the furnace.

\Vith a round shell it is evident that any projections,depressions, or out-of-round shape given to the face of thelining must result from the lining being made of unequal thickness. The shell of the furnace is kept cool,sometimes by means of water-chambers connected therewith and sometimes by means of water sprinkled on the shell, by reason of which the lining neXt adjacentto the shell iskept at a moderate temperature. The thicker portions of the lining become overheated and are soon wasted away, so that, usually after a run of perhaps fouror live hours. or less, the out-of-round features will have disappeared, and consquently the furnace will have ceased to perform its functions of working and shaping the mass of material being puddled, necessitating a stop page ofperhaps two hours, (more or less,) to re new portions of the lining to give it its out-of round character. Of course such frequent stoppages greatly increase the cost of puddling in this class offurnaces. In view of these difficulties we have devised the following, to wit: \Ve first decide what form in crosssect-ion for the face of the lining will be likelyto give the best results, and then build a casing to correspond, so that the lining, when made of uniform thickness,will at the same time be of the desired form inside. \Vith such construction there are no thick places to become overheated and rapidly wasted away, resulting in a radical change of the form, always tendingtoward a round shape corresponding with the shell; but, on the contrary, the lining, being of uniform thickness, remains at an even tempera' ture, so that the wear and tear is about evenly distributed, and the tendency is to retain the desired original form of lining corresponding with the shell.

\Vith our improved construction the lining is much more durable than in furnaces as heretofore constructed. We find that a polygonal form in cross-section is well adapted to the purpose, and we prefer a pentagon, and have so illustrated our invention in the accompany ing drawings; but we do not wish to be under stood as limiting ourselves in anywise to this particular form.

Figure 1 is an elevation, in longitudinal section, of a furnace embodying our invention. Fig. 2 is a side elevation in transverse section through the center of the furnace.

A represents the shell of the revolving furnace, and a the lining to the same. As shown in Fig.2, the form of the shell in cross-section is a pentagon, and the lining is intended to be of uniform thickness, so that the inside of the lining is of corresponding shape with the shell.

This form is found to be well adapted to roll and tumble the mass being treated, so as to properly work the same and form it into suitable shape to be handled and removed from the furnace. The annular tracks B and gear 0 may be attached in any suitable manner to the shell, one form of attachment being shown in Fig. 2,where flanges b are secured to the angles of the shell, and in turn support, respectivel y, the tracks and gear. The tracks 13 turn on the wheels D, arranged in the usual manner, and the gear 0 is engaged by a gear, 0,

also aware that a polygonal furnace constructed of iron lined with fire-clay and shaped in the form of a pyramid or coneis not new,and hence we make no claim to such constructions.

In our device the casing and lining. are made 30 up of a series of plane surfaces,which are better adapted to roll and tumble the mass being treated than the curved sections above referred to, and are more durable than the linings of unequal thickness.

WVhat we claim is- In arevolving puddling-furnace, the combination, with a shell having reduced ends, as shown,'the body of said shell being made polygonal and preferably pentagonal in cross- 40 section,of alining arranged inside of the shell, said lining being substantially of uniform thickness, so as to conform on its inner face to the shape of theshelhsubstantially as set forth.

In testimony'whereof we sign this specifica- 5 tion, in the presence of two witnesses, this 9th day of January, 1886.

SAMUEL T. WVELLMAN. GEORGE W. GOETZ.

Vi'tnesses:

THos. H. BROOKS, F. R. S. NEWPHER. 

